Valve assembly



y 15, 1952 J. F. ARMSTRONG EI'AL 2,603,444

VALVE ASSEMBLY Filed May 28, 1948 I LJI l I FlG.l.

28 INVEN TOR.

JAMES FRED ARMSTRONG FRED A. KOMMER FIG.2. W/R a ATTORNEY Patented July15, 1952 --.Iames Fred Armstrong, Detroit, Mich and Fred 7'carburetorifionporation, St. Louis, Min-, ac'orpuration of'DelawareApplication May 28, 1948, Serial No. 29,828

1 Claim. 1

This invention relates to valve assemblies and consists particularly ina novel sound-proof mounting for a rotatable disk or butterfly type ofvalve, especially for an automotive carburetor.

This type of carburetor ordinarily has a pair of butterfly valves, onecontrolling the air inlet and the other the fuel mixture outlet. Thechoke valve, particularly in an automatic choke type of carburetor, mustmove freely, and the necessary running clearance between the valve andthe wall of the air inlet, has in some cases, resulted in the edge ofthe valve playing back A and forth and contacting the wall. Where theengine is provided with resilient mountings, the vibration set up mayproduce a very objectionable hum at this point.

According to the present invention, this disadvantage is overcome byproviding ample clearance at the side edges of the disk valve andmaintaining the valve centered by means of sound-proof or non-metallicwashers lodged between collars on the shaft and outwardly facingabutment surfaces on the outer portion of the air inlet wall.

Accordingly, the main object of the present invention is to provide afree operating valve assembly in which the valve is maintained centeredso as to avoid tapping or humming sounds when the assembly is subjectedto vibration.

This object and other more detailed objects hereafter appearing areattained by the device illustrated in the accompanying drawing in whichFig. 1 is a side view and section of an automotive carburetor embodyingthe invention.

Fig. 2 shows an enlarged detail of the structure in Fig. 1.

The carburetor shown is of the dual downdraft type including a pair ofmixture conduits 5 having a common air inlet horn portion 6 and outletportions 1 flanged as at 8 for bolting to the usual engine intakemanifold (not shown). Fuel is supplied from a constant level chamber 9through main nozzles, one being shown at I!) discharging into primaryventuri ll. Fuel may also be supplied through the usual idling port l2adjacent the edge of the throttle valve when closed, and an acceleratingpump system (not shown).

The entry of air to the air horn is controlled by a disk or butterflytype of choke valve l5 mounted by means of screws IS on a shaft H whichis journalled in bearings [8 formed transversely in the wall of the airhorn portion. The

discharge of mixture from the barrels is controlled by a pair of diskthrottle valves l9, only one being shown, mounted on a shaft 20 whichprojects laterally from the right hand side of the carburetor where itmounts a lever 2| for manual operation.

Choke shaft H, at its left end, projects into a housing 23 whichencloses automatic choke control mechanism, including a thermostat andother parts (not shown). In order to insure free rotation of shaft l1within its bearings, the side edges of disk l5 are relieved, as shown at24, so as to clear the inner wall of the air inlet horn when the valvehangs open.

In order to maintain the valve centered and prevent contact between thevalve and air horn, a pair of non-metallic, sound-proof washers 25 and26 are received on the choke shaft. Washer 25 is lodged between a crankarm 21 rigid on the shaft and an opposing outwardly facing surface onthe air horn structure, in this case, within housing 23. Washer 26 issimilarly lodged between crank arm 28 on the right hand end of shaft l1and an outwardly facing surface on the bearing forming portion of theair horn. Cranks 21 and 28 each forms, in effect, an annular shoulder orcollar on the choke shaft. Washers 25 and 28 form a free running fitbetween these shoulders and the air horn, while maintaining the valvesubstantially centered and preventing contact between the valve and airhorn inner wall due to end play in the journal bearings.

The shaft journals are relieved as at 30 and 3| to further ease therotation of the valve and thus insure its control solely by the airpressure applied thereto and the mechanism within housing 23.

The exact positioning and shape of washers 25 and 26 are not essential.

The exclusive use of all modifications as come within the scope of theappended claim is contemplated.

We claim:

A valve assembly comprising a conduit having elongated, transverse,aligned apertures forming bearings, a shaft rotatably received in saidbearings, the shaft within each of the bearings being reduced indiameter to form spaced annushaft and having a free running fit betweensaid shoulders and the conduit wall, and an unbalanced valve disccarried on the shaft within the conduit variably restricting the sameunder the influence of air pressure, said valve disc having flattenedareas at opposite edges, said flattened areasbeing slightly spaced from.the inner wall of the conduit adjacent said apertures, and said valvedisc being so centered by said washers as to permit free rotationwithout metalto-metal contact of the parts except at the hearing areas.7

JAMES FRED ARMSTRONG. FRED A. KOMMER. l

Number Name Date 1,296,922 Clairmont Mar. 11, 1919 a 2,059,656 7 RingNov. 2, 1936 2,134,844 Schartow Nov. 1, 1938 2,282,825 Puffer May 12,1942 2,285,829 Maage June 9, 1942 FOREIGN PATENTS i Number 1 CountryDate 38,648 Netherlands -t of 1935 207,290 Switzerland of 1934REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS

